<?php

/**
 * @file
 * Contains the RSS style plugin.
 */

/**
 * Default style plugin to render an RSS feed.
 *
 * @ingroup views_style_plugins
 */
class views_plugin_style_rss extends views_plugin_style {

    function attach_to($display_id, $path, $title) {
        $display = $this->view->display[$display_id]->handler;
        $url_options = array();
        $input = $this->view->get_exposed_input();
        if ($input) {
            $url_options['query'] = $input;
        }

        $url = url($this->view->get_url(NULL, $path), $url_options);
        if ($display->has_path()) {
            if (empty($this->preview)) {
                drupal_add_feed($url, $title);
            }
        } else {
            if (empty($this->view->feed_icon)) {
                $this->view->feed_icon = '';
            }

            $this->view->feed_icon .= theme('feed_icon', $url, $title);
            drupal_add_link(array(
                'rel' => 'alternate',
                'type' => 'application/rss+xml',
                'title' => $title,
                'href' => $url
            ));
        }
    }

    function option_definition() {
        $options = parent::option_definition();

        $options['description'] = array('default' => '', 'translatable' => TRUE);
        $options['mission_description'] = array('default' => '', 'translatable' => TRUE);

        return $options;
    }

    function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);

        $form['mission_description'] = array(
            '#type' => 'checkbox',
            '#default_value' => !empty($this->options['mission_description']),
            '#title' => t('Use the site mission for the description'),
        );
        $form['description'] = array(
            '#type' => 'textfield',
            '#title' => t('RSS description'),
            '#default_value' => $this->options['description'],
            '#description' => t('This will appear in the RSS feed itself.'),
            '#process' => array('views_process_dependency'),
            '#dependency' => array('edit-style-options-override' => array(FALSE)),
        );
    }

    /**
     * Return an array of additional XHTML elements to add to the channel.
     *
     * @return
     *   An array that can be passed to format_xml_elements().
     */
    function get_channel_elements() {
        return array();
    }

    function render() {
        if (empty($this->row_plugin)) {
            vpr('views_plugin_style_default: Missing row plugin');
            return;
        }
        $rows = '';

        // This will be filled in by the row plugin and is used later on in the
        // theming output.
        $this->namespaces = array();

        // Fetch any additional elements for the channel and merge in their
        // namespaces.
        $this->channel_elements = $this->get_channel_elements();
        foreach ($this->channel_elements as $element) {
            if (isset($element['namespace'])) {
                $this->namespaces = array_merge($this->namespaces, $element['namespace']);
            }
        }

        foreach ($this->view->result as $row_index => $row) {
            $this->view->row_index = $row_index;
            $rows .= $this->row_plugin->render($row);
        }

        $output = theme($this->theme_functions(), $this->view, $this->options, $rows);
        unset($this->view->row_index);

        return $output;
    }

}
